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1 Notes for the planning engineer
1.1 Overview
The @Link option allows the integration of Nordmann AT4 humidiers into
a BACnet/IP or a LonWorks network. The @Link option features a serial-
interface Gateway which converts the information from the host Modbus
protocol to a specied secondary protocol.
The following protocol options are available and must be specied when
ordering (ordering form see page 23):
Part Number Protocols Part Description
2559069 BACnet/IP BMS AT4 Master set for BACnet /IP
2559070 LonWorks BMS AT4 Master set for LonWorks
2559071 BMS AT4 Slave set for successive units
The following read out and settings functions are available:
Functions AT4
Read out of unit status (operating mode, etc.) X
Read out of service messages X
Read out of analog (%) and sensor (%rh) demand X
Read out of unit type X
Read out actual system request X
Demand signal (%) / sensor signal (%rh) X
Setting the power limitation X
Setting the humidity setpoint (%rh / internal controller) X
Setting the proportional range X
Setting the integral time X
1.2 Network diagrams
It is possible to link up a maximum of 8 units via a single ProtoCessor
Gateway to a building management system. The ProtoCessor Gateway is
connected to the lead unit. All other units (up to a maximum of 8) are daisy-
chained via the NetworkLink terminals.
Since each unit can be separately addressed, it is possible to monitor and
control each unit individually. Different network congurations may be achieved
and are mostly dependant on the type of network present at the site.
